Tissues Flashcards
Name the specialized function of nervous tissue?
Generate, receive,process and transmit nerve impulses
Also involves in coordinating body activities
Name the germ layer form which the nervous tissue is originated
Ectoderm
Name 2 types of cells in the nervous tissue?
Neurons
Glial cells/ neuroglia cells
Name the main type of cell in the nervous tissue
Neurons
Name the most abundant type of cell in the nervous tissue
Glial cells
Name the basic structural unit of the nervous tissue
Neurons
Name the basic functional unit of the nervous tissue
Reflex arc
Name the function of neuron
Receive, generate and transmit nerve impulses
Name 3 types of neurons
Sensory neuron
Inter neuron
Motor neuron
Function of,
1) sensory neuron
2) inter neuron
3) motor neuron
1) transmit impulse from sensory receptors to the central nervous system
2) connects sensory neuron and motor neuron
3) transmit nerve impulses from CNS to the effector organs
Structure of motor neuron
Shape of the neuron Cell body Organelles present and absent in the cell body Dendrites Axon and myelin sheath Telodendria
Name the neuroglia cells which involve in forming the myelin sheath
Schwann cells
Function of myelin sheath
Speed of the nerve impulse is increased
Function of the dendrites and cell body
Used to receive nerve impulse from other neurons
Function of axon
Used to transmit nerve impulse to other neurons , to cells or to muscles
What forms a nerve
Axons bundled together to form a nerve
Name 2 main factors influencing the speed of the nerve impulse
Presence or absence of myelin sheath
Diameter of axon ( d increase speed increase)
State two types of nerves
Cranial nerve - nerves originated from the brain
Spinal nerve- nerve originated from the spinal chord
State the no of pairs of ,
1 ) cranial nerves
2) spinal nerves
1) 12
2) 31
State 3 types of nerves depending upon their structure?
Sensory nerve
Motor nerves
Mixed nerves
What type of nerve is the spinal nerve?
Mixed nerve
State the function and composition of each nerve type?
1) sensory nerve
2) motor nerve
3) mixed nerve
1) only sensory neuron
Transmit impulse from sensory receptors to the CNS
2) only motor neuron
Transmit impulse from CNS to the effector organs
3) both sensory and motor neuron
Transmit impulse both towards and away from the CNS
State 3 neuron in the reflex arc?
Sensory neuron
Inter neuron
Motor neuron
What is a reflex arc?
It is a neuronal pathway which connects sensory receptors and effector organs through the CNS
State 4 functions of neuroglia cells?
Nourishment of nerve cells
Insulation of nerve cells
Replenishing neuron
Modulate neuron function
